.root {
    margin: 0 auto;
    padding: 64px;
}

button {
    display: block;
    background-color: #BBB;
    margin: 0 auto 8px auto;
    border: 0;
    padding: 8px 12px;
    border-radius: 4px;
}

button:hover {
    background-color: #999;
}

button:active {
    background-color: #777;
}

.row {
    display: flex;
    flex-direction: row;
    gap: 12px;
    overflow: auto;
    max-height: 350px;
}

.column {
    display: flex;
    flex: 1;
    flex-direction: column;
    gap: 12px;
    background-color: #333;
    padding: 16px;
    overflow: auto;
    max-height: 340px;
}

.panel {
    position: relative;
    padding: 32px 64px;
    background-color: #aaa;
    border-radius: 4px;
}

.panel::before,
.panel::after {
    position: absolute;
    left: 0;
    width: 100%;
    height: 4px;
    background-color: #0ea5e9;
    border-radius: 8px;
}

.panel::before {
    top: -8px;
}

.panel::after {
    bottom: -8px;
}

.panel--above::before {
    content: '';
}

.panel--below::after {
    content: '';
}